feat: support expanding/collapsing toggle list in read-only mode

[Ramrajnagar]

Feature Preview

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

Summary by Sourcery

Support toggling the collapsed state of toggle list blocks while in read-only mode without persisting changes to the document.

New Features:

• Allow users to expand and collapse toggle list blocks when the editor is not editable.

Enhancements:

• Introduce an internal read-only collapsed state used for rendering and visuals, while preserving the stored collapsed attribute for editable sessions.

[CLAassistant]

All committers have signed the CLA.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds support for toggling the expanded/collapsed state of toggle list blocks while the document is in read‑only mode by separating the persisted collapsed state from a local UI-only state and routing all UI logic through an effective collapsed flag.

Sequence diagram for toggle collapse behavior in editable vs read_only mode

sequenceDiagram
  actor User
  participant ToggleListBlockComponentWidgetState as ToggleListBlockState
  participant EditorState

  User->>ToggleListBlockState: onCollapsed()
  ToggleListBlockState->>EditorState: editable
  alt editorState.editable == false
    ToggleListBlockState->>ToggleListBlockState: setState(_readOnlyCollapsed = !_effectiveCollapsed)
    ToggleListBlockState->>ToggleListBlockState: _effectiveCollapsed used in build()
  else editorState.editable == true
    ToggleListBlockState->>EditorState: transaction.updateNode(node, {collapsed: !collapsed})
    EditorState-->>ToggleListBlockState: updated node.attributes[collapsed]
    ToggleListBlockState->>ToggleListBlockState: _effectiveCollapsed uses collapsed
  end

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File-Level Changes

Change	Details	Files
Introduce a UI-only collapsed state for toggle lists in read-only mode and route rendering logic through a unified effective collapsed flag.	Add a nullable _readOnlyCollapsed field and _effectiveCollapsed getter that falls back to the persisted collapsed attribute Replace existing usages of collapsed in build/render logic (main build method, background color computation, placeholder visibility, and icon rotation) with _effectiveCollapsed to ensure consistent behavior between read-only and editable states Update background color logic to depend on _effectiveCollapsed instead of the stored collapsed attribute so the visual state matches the UI state	frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/toggle/toggle_block_component.dart
Allow users to toggle the visual collapsed state of toggle lists in read-only mode without persisting changes to the document model.	Guard onCollapsed with an editorState.editable check to differentiate editable and read-only behavior In read-only mode, update _readOnlyCollapsed via setState to flip the current _effectiveCollapsed value, avoiding any document transaction In editable mode, preserve existing behavior by issuing a transaction that toggles the node's ToggleListBlockKeys.collapsed attribute	frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/toggle/toggle_block_component.dart

Possibly linked issues

• #FR: The PR implements read-only expand/collapse behavior for toggle lists exactly as requested in the feature issue.

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[sourcery-ai]

Hey - I've left some high level feedback:

• The _readOnlyCollapsed state is never reset when the editor transitions from read-only to editable (or when the underlying collapsed attribute changes), so once a user has toggled in read-only mode, _effectiveCollapsed may keep using a stale _readOnlyCollapsed instead of the persisted value; consider clearing or resyncing _readOnlyCollapsed in didUpdateWidget/didChangeDependencies when editorState.editable or node.attributes[ToggleListBlockKeys.collapsed] changes.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `_readOnlyCollapsed` state is never reset when the editor transitions from read-only to editable (or when the underlying `collapsed` attribute changes), so once a user has toggled in read-only mode, `_effectiveCollapsed` may keep using a stale `_readOnlyCollapsed` instead of the persisted value; consider clearing or resyncing `_readOnlyCollapsed` in `didUpdateWidget`/`didChangeDependencies` when `editorState.editable` or `node.attributes[ToggleListBlockKeys.collapsed]` changes.

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[Ramrajnagar]

Hi team! I have addressed the edge-case feedback regarding the _readOnlyCollapsed state resetting on external attribute changes in my latest commit.

The CLA is signed, and the PR is ready for your review and for the CI workflows to be approved. Thank you!